Extension-table.



No. 653,326. Patented July 10, I900.

' E. TYUEN.

EXTENSION TABLE. A umion filed m. s, 1599.)

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U ITED STATES PATENT OFFICE.

EMIL TYDEN, on II sT'IIves, MICHIGAN.

EXTENSION-TABLE.

SPECIFICATION forming part of Letters Patent No. 653,326, dated July 10, 190(1). Application filed November 3, 1899. flerial No.735,664=. (No model.)

To all whom it may concern:

Be it known that I, EMIL TYDEN, a citizen of the United States, residing and having mypost-office address at Hastings, Barrycounty, Michigan, have invented certain new and useful Improvements in ExtensionTables,which are fully set forth in the following specification, reference being had to the accompanying drawings, forming a part thereof.

This invention relates to the means for connecting the fillers or leaves of extension-ta bles. This is customarily effected by dowelpins generally secured in one member and taking into sockets in the adjacentmember.

Great difticultyhas been experienced in making these junctions so that they are not affected by the warping of the leaves to an extent which prevents or renders difficult the A is the member or leaf which has the dowel-pin or tenon.

Bis the adjacent member having the socket to receive the dowel or tenon. It will be understood that of the filler-leaves oneedge is provided with the dowel and the other with the socket, so that the two parts A and B may be considered merely as a representation of the opposite sides or edges of the same leaf or filler.

0 represents the dowel-pin or tenon, which may be of any form-that is, may be secured in the leaf to which it pertains in any suitable manner. I prefer to employ a metal tenon, and certain details of the form of the tenon shown in the drawings are such as would pertain only to the metal tenon; but for the purpose ofmy present invention I do not limit myself strictly to such a tenon.

D is the socket which is providedto re ceive the tenon or dowel. Itis ashort'sleeve or annular bushing having an axial aperture extending entirely through it, countersunk or tapered at one end, which is the outer end when the bushing or socket is inserted in its place in the leaf. This socket or bushing may be made very short and nevertheless be securely held in the leaf by having formed upon its exterior cylindrical surface a fine iatchet-shaped bead or thread D. This bead or thread should not 'be sufficiently deep or protuberant to prevent the driving of the socket into the hole which will be bored in'the edge of the leaf to receive it; but the thread being formed with its abrupt shoulder facing outward-that is, toward the countersunk end-and with a long inclined slope on the side which faces inward it may be driven readily into a hole whose diameter is only that of the bushing exclusive of the thread, the thread forcing the wood aside suffi ciently to pass it and the wood reacting again into place in front of the abrupt shoulder of the thread, so that escape is resisted. When this head is, as it can be most easily made, in spiral form, as indicated by the word thread above applied to it, it facilitates the removal of the socket, if that should ever be desired, because it can be taken hold of firmly by a tool, which may be forced into the aperture until it engages it tightly and then screwed out. Preferably the wood is bored in the form shown in the drawings that is, an outer bore or socket b is made of the diameter of the bushing or socket-piece D, and concentric therewith, leading back from such bore, there is a bore bof reduced diameter,

preferably slightly greater than the diameter of the aperture 01 in the socket D at the inner end-that is,where it is not enlarged by counter-sinking. This construction permits the dowel-pin to pass through the socket D into the bore 1), and by reason of the diameter of the latter being a little greater than that of the aperture in the socket, and therefore greater than that of the dowel-pin, the latter is not liable to encounter the margin of said bore, and it does not therefore chafe the Wood, which would eventually tend to fill upthe bore and prevent the tenon from making a full entrance, as it ought in order that the leaves may close up perfectly and abutwithout crevice.

It will be observed that the axial aperture in the socket, except as to the countersunk outer end, is cylindrical and that the portion of the pin which enters the socket is likewise substantially cylindrical, the diameters of the aperture andpin being such as to make a practically-close, but not tight, fit. This is desirable in order that when the pin is drawn to the aperture by the countersink at the outer end the surfaces of the two boards whose edges are thus connected may be flush, notwithstanding the Warpingof one of them, and I that they may be held with their upper surfaces in substantially the same plane even though their edges should become somewhat separated, so long as the separation is not enough to withdraw the cylindrical portion of the pin from the cylindrical portion of the socket.

I claim-- 1. In an extension -table, in combination with the top boards, dowels or tenons projecting from one edge of said boards at each junction, and metal sockets let into the adjacent edge at such junction, such sockets being axially apertured and countersunk at the outer end of such aperture, the pin being of substantially-uniform diameter throughout its protruding portion.

2. In an extension-table, in combination with the boards of the table-top, dowels or tenons projecting from one edge of said boards, and recesses in the adjacent or facing edge at each junction, the recesses being at least as deep as the full length of the protruding portion of the tenons and metal sockets, or linings for said recesses, having axial'apertures countersunk at their outer ends, and at their narrowest point substantially equal in diameter to the diameter of the tenons, said narrowest point being at the limit of the countersink, and relatively remote from the bottom of the recess.

3. In an extension-table, in combination I with the boards of the table-top, metal dowels set into the edge of one board at each junction, the facing edge of the adjacent board having recesses as deep, at least, as the projecting portion of the metal dowels; metal sockets, or linings, for said recesses, having axial apertures countersunk at their outer ends, and at their narrowest point substantially equal in diameter to the diameter of the dowels, said narrowest point being at the limit of the countersink, and relatively remote from the bottom of the recess.

4. In an extension-table, in combination with the boards of the table-top, dowel-pins or tenons projecting from one edge at each junction, and metal sockets let into the ad jacent edge, such sockets being axially apertured and countersunk at the outer end of such aperture, and exteriorly provided with a fine ratchet-sh aped head or circumferential thread, having its abrupt face forward anda long, sloping face rearward.

5. In an extension-table in combination substantially as set forth, the adjacent boards of the table-top provided at their abutting edges, one with the dowel or tenon, and the other with a metal socket adapted to receive said tenon, the socket being axially apertured from end to end and said aperture being enlarged taperingly at the outer end, the board in which such socket is set having a bore of suitable diameter and depth to permit the socket to be set in flush with the outer edge and havinga further bore extended back from the center of the first of reduced diameter but of a diameter slightly greater than that of the aperture in the socket at the inner end of the latter.

In testimony whereof I have hereunto set a my hand, in the presence of two witnesses, at

Chicago, Illinois, this 30th day of October, 1899.

EMIL TYDEN.

Witnesses:

CHAS. S. BURTON, ADNA H. BOWEN, Jr. 

